Abstract
Novel porous poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) copolymer membranes were prepared with zinc chloride as an additive and silica as a ceramic filler. Porosity of the membranes was determined by Scanning Electron Microscopy (SEM). Inclusion of ceramic filler decreases the crystalline character of a polymer which facilitates the movement of ions leading to an increase in the conductivity. The infra-red spectroscopic and EDX measurements revealed the presence of acid moieties in the composite membranes. The thermal stability of these blend membranes lies above 400°C, which is sufficiently high for use in DMFC. The membranes prepared for this study exhibited the ionic conductivity in the range of 10−3 to 10−2 S/cm and the methanol permeabilities ranged between 10−9 and 10−7cm2/s.
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